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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b7a4250062277429db5d656c958f9904983957f0949595d624086cae7a7a21' 
  AND token = 'HvbC2lFnCGCS4vjO8B+vq0CcpeI2OFtPkkf3FdFQ//Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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