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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1e0588c7356f96426e752ae3ace4009dbe86fd61bc5882f39ec2efca4dd100' 
  AND token = 'G7OObb1Kn6G584G11D7IB4/4AFWAFNpPIwPePVLPho4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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