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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f597d8bd7353c580b31620a4420ca9a73f296e231cf2b37479afc5148f0e6c' 
  AND token = '1Bj/Z51dspm0MTfUXqiq7pWUCCHAF1aj3Wr/WuD4Tic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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