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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c1cba524ae09693cb2110fb0f532c3d57b30457b142326b4eb47452b77554e' 
  AND token = 'T4iUnjyH0az0a5dHgcWKGvGX2+grg2gnC/egnIUY2+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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