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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34490949d6c6d3c23f02017c1d862597b1551cdc089eae781893c80a93b3c55e' 
  AND token = 'R5eAZBPk2v2FWgEjy/gePHVeFLVCIeyTTqPEZkchqfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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