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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3f0629a7a3d1adc5ecaca145e60b9a20aa3f47193807f964bb23198f86a447' 
  AND token = 't9IhXrQtP6ybqW3TZHDKu1YttyINvk3J+qy4TveW/m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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