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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17c170d5b99b8e4dd8ab4b73f1128b22194b874cacef7d78499e8f8c88d129b' 
  AND token = 'X9TjCdJYrrdbF1O1AMDKE75lN7Q/J0okxPIn+I14Wlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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