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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b17fc625c98c68713016ab7407e5b1b97e587458c3809c203275afd134e5887' 
  AND token = 'pm003k3oQKmtlIKLzM1FFjsYSlfble14GvemrMdFuSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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