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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1936267761c8b2100cb8fca5177af1ff38301c2db19f577241d74e9799adfe02' 
  AND token = '0TVnC3NcxNMbBSfWUOxrbxrZXs8TEwMcZezQJNHszRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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