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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34dd8683d44f237aa2b0b66593d3f520fbb096a7be8ecc0829552df6c1c9d964' 
  AND token = '6AEpwXmPQt8MrU+82PxB1D/5JM4TsPAnWmVnetVntvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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