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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b64eed2dcedabbf3fa378e5dd56dc2b7b4aa5385f4894848804dd1bd02361e' 
  AND token = 'ZzDNKAaE0VOfCg2kN83JrSnNVqxh+PXyVLp8/fOi+Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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