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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68fd5fcdd2e3a1d66ae45571f61a56abe76b11e13b3959d10067cc6c8487de1' 
  AND token = 'xJ436Ibc5Sd3r9JZk75ipgY/KrACZ3Cepyhe5KeInF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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