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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b34c78acb7170ecb23e998506271e6d38e9bd5209ef3ad44d6d5c1f3cca738' 
  AND token = 'VCg9w/Zqw0mHJDUaJIb1tKoHbEbxcF61GoQ4L2srBa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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