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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace7f77a5c64c1c2ed99d4bc616704e84cc64577458f393645c7fab95fab327f' 
  AND token = 'l2zrV6G6m+5Q/6n6dJONh+o19gFDxN1xQafZAS124vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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