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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e0c3ced426aeac6924916a75b1a05ce4234a91c820aae35f25868ff19eccc8' 
  AND token = 'n0wc2CfWv1SgAXFADY+kZSnSUoHBY6DiX6Hzw3pXn+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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