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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1c5102b3a51009e5ce24316211d0b956a9fa151bfc1715e43b47923674f55e' 
  AND token = 'q8iljiYO3apxiwQDVkW/baAps/l6e2/ltT6fTmJrpXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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