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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319ddd18e5a82e9ec4b06127f8a64ac3f31c79e2b55bfa1934d1f85052e32e83' 
  AND token = 'KgoErcbEBtCOXR00IYXYLY80jxC7ahtLLTh1S6pK18E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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