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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85faf25bf8bf8e210903a29e8f044797d72183be7bc3ac72a4d3438e17649322' 
  AND token = 'bstr7C3sglyxTpgFMPYve3QPu9AVxWq5FAO+fBGFTgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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