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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b66bae9f245c62a1c38577b26e344049e6583c32898d35b749d1ce910d08e0' 
  AND token = 'kOi3K7Np8i7YQNt3joO0qplAablHawAW6ciTy/F1oz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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