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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d052dd0babe6ecb1df404ab48cf5c7f81fd53b13804f024e26753319efad4aa' 
  AND token = 'f70s9zQHHANhQQYAiUY4LT0nuLZt4XThNvJKq+63zhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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