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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62414b6d285aded02525236bf5b71e754590ec0b6fb4ddd5c3593d92d937f656' 
  AND token = '6b5GPl/nhfmNh2d+4TwPkIyDolu0fGNoLq5e5YBsELw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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