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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082cd46fce892afa342e035cfdb2a8564fc8909bbf4911686cceece40477ba7f' 
  AND token = '3c3g04RGfu3xUdzFPcxDjbc249ql/STY/3Nd86e55pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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