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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ebe523a390e1a4b9088bc11afb1881e94b76878589d78f1aef0d474d0d9671' 
  AND token = 'h0SS77tTI5qcurCa4icUkxEJEjzw18DMK1kyyGvv/rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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