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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d493e648e47899216c46dca0143f4b32911a0e7d61d2227355b22211ab8422' 
  AND token = 'Qgn//uoWgVTAA/r1Wx6sZnAVWSCYAtpOtLJRSVEp4Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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