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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a0b8ec9e3a8728c9b357caea976a0fbc7d86aa60686105119559975ba6a9e6' 
  AND token = 'NG4/pEMjWssvnUO60DUiZezwWnK0zp8ZTGBd3Aq0MOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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