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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08ddc442423872165c880c5cf4525c05b00fa8d97c22ea00be11c06789ef433' 
  AND token = '6OlAJqSQVFYiv1HAATq/W683LO7E/9DNVhDsgM7DbTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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