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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0e67e8af7d583e020e46ee344e481cf387cdd462e6598382f58433a45b67d2' 
  AND token = 'sgDgjdbV/jYv/6R03knOF7ISufLlxhkfVYCxDq2ToDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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