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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903a1c52448e80ec40a4fcf1477fb258ecf370e8d906905435ea5fd10d1f070d' 
  AND token = 'h0cbSPbNvReKdTc77t/0WkX8/RgsO9RSGTfcNB6ualI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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