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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f90b9defa61f55964435394501e6f5d499bf2ea184fc3ac56f2a7030d3d7b1' 
  AND token = 'oR3PtO4bF+72E6BfwYZo3j/h5oo/D/+DtBsyt/YFk4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}