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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317c6b239987267584137a9b1e47b452cce90fec4663e9e405fcb2ea5d576108' 
  AND token = '3pFOr1BbyAmLVA04fenKl5B5sPz78IKQP1VerLPkIQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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