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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd850abe1b4744e827e95aabf7e0d0b9ff0c817787a9deb915504148c1d4e64b' 
  AND token = 'WSICAse8boB0QBaRVMAxE6aCpju9GGwSkzPX/kNIh8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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