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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c993e6dade482c9225b9309c4929216ab593e0d74dd482f21a0a463a0e9ad706' 
  AND token = '9GNdqGyUPmChak9oTmxxermS2SIkxYZgXYzd0WX1Hjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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