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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa11d68b131051b428020ea0b2e6706312c2f00fa5c3a3a646f358b907defa9c' 
  AND token = 'IOMBhe4I0J+/I2hCRqywKHNs0T9uBo4hCtgvtLF4iC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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