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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd81fad8071a82022cb77e882c6256dd074152c088a39a2aae5f5e929efe9045' 
  AND token = 'rafWOwDZD1NgAFhavDOYdfFEA9cjrgS3NfeMpb3VVnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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