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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbee2e2a6afe94f8d62361c9e3916a82ad32167647fc6b957583c650b691baa0' 
  AND token = 'N+qyDt5eHayyArThC7y+isGheHMw+SUuR9a7PovSxVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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