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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d8ec7280cb012b0ec3999a8ce16af206cee4867f456044c7fa48f7d0145263' 
  AND token = 'einhgS6FSEAaFe7HPhJxobVJIRMSc74CMFehG0rdfsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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