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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4d71fac7fa70c11c3b44ee8c2f53f25946aad7571cf43e2f4b74ef70ec3ee8' 
  AND token = 'uitvlaQw9dN5mLlFuTya1p7J6ERYqPzvhxJ1/U5fAaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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