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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e36dd5c03a7ba323dbfa6df85d693f2641a911a60e8bfc1e09e84434b6f4c1b' 
  AND token = 'lbwNVolQihA7cqevmksqWhNWBtIj8fX7PF2U9lL5DFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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