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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3190826c96e55a4d6ef6d97a1c5451286b3a00d08b8f1985281850b45bcb07' 
  AND token = 'k2sMX2p0dJFOePrc9FDJUsZ2sN9cWgQZ9xR86whfqMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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