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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b772b96cd4c0bd89d44a6494eb7b4cc69d3ef6c1b12ec64ce6b1afb1a3acb7d7' 
  AND token = 'MzlUQoFU7z/ciJ42aPl4rB4ROL3Z/YaoR1l39S/AMh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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