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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d380d2c47b1516d12730845099f360e0fe8e406d476e89e437cd9db48419c7a' 
  AND token = 'w8XSYQE7QBshLeyJLBp+2qT4cEimnPqw+7hyF2Jf3/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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