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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bd4ca7a54f1ae17acb8ab6ed804668d3072f8e6c3443ecb487fa7ff56df944' 
  AND token = 'wpd1pfrLgjkPqHO8ZGZ1SLJ69nv8/CUgax5yT1YL8yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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