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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a1ec0be297a28fee6db7aa3538a4c5280ac275fff18e9872d3a3281080bd77' 
  AND token = 'wahLPa4YbX4jbIaLjfYpTWWL0XZ4QLTtVcuVdlNpLzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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