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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549bc6e0123d0dfc55d15c05ef28d77cb8a27c2bb7ac67d44a7ec6a06224117a' 
  AND token = 'E2lxyem08vDOjgNjWLfFBLwYCZI1cE0gn6AyBQipRu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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