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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d531ee26a4e422298ad6ee7cd43d84f20272108c797cf307e0cf09c9e845e46' 
  AND token = 'OViw2JakEOvixdyxzZfxkO+u0twGG2nSyfabbD4QYw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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