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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e905c599635b90b6703d37a0f07d71f1f66b8ad904e1bd9f9272391d8d7fe0df' 
  AND token = 'fnEDmI1leSMzK3vfXSV4B5UCCFevATrQKMKQDSvB6WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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