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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697eb93e0fcc56d27a9736e8e79eda508f170d9f06d52308d01ef94bd2505b98' 
  AND token = 'OKcP1b45a4kQxZocep3dGwZlm5lt4PL/vb4Z0g5wM4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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