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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1537883caa7abb6e5b8384271f639b0b17126ad61916d505601c8127ba187374' 
  AND token = '01eiN9dfMpJg39dotkPO7WV6AE8AgEw8q0uMoVViFlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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