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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66feb7a2a03e04fc60ee51bfab11b0dc287bceed6ca8c6890dfb4ec6acf71767' 
  AND token = 'jn3wu02kuamyzh1Bp92KEbS1a7kVAG1nMUhLDEtpl4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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