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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60daa278694d5afd29071eb6f2bb5b5b130e139f1139fd77972a25b420e214bf' 
  AND token = 'p1hQUNrzceIfjbTej5w0D2/J1TygIzM3lUK547TuoNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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