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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb532d3a1e40ac38e7aeab234117cc8ee6fdf3372f4401cd5a0255c4612ba78' 
  AND token = 'Nbw/gn984cg+v5VGv2jMgP/i7mU8S0XubUeUb7kdgUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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