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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8d2b36d52c2555916eb156d0e4b144b24cd5aa662f869fdabb74e5cdb94054' 
  AND token = 'cwHc9zzAi25SFrpzI3f4Q2f51HwiIKRGhXS2VzFEQ58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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