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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0764460650233ab369b8399965ef69f5c520947741c701e8c3b439e7499d324' 
  AND token = 'rVDqLV3oGSO0JmLDWfxeaRyv4AELBFI6Sqt3MSzm6so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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