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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6634f360b0cbe98c3d51174081ba0f2bcbbc6ddba3afa3b8c2ce5391e4edd50d' 
  AND token = 'Fgnw/GtijZmfrlkspjo0iTKsYr6bAgEud1vSYtXPBLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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