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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17152a4bf075c703f248ff95770e811670d3ce1d429451e4e01fb4d189f6711' 
  AND token = 'J+eWRCtRBiPTa4JL7s0sC/7fUTh46y+X+0G6W+/iLKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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