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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71290b8a257536c92d6db2909c222335df9d0b1132dba77f2f17e7459227933' 
  AND token = 'Udgu2DcFQaPcJmvIIr+i0oXNa1Npex7qcbE2lfJFRpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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