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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d7029326a171a9ee93bcac85f57c8a29d75a0adaee01587d22ec463cbd8a10' 
  AND token = 'ZU94efBdk/hul8aSmW2cwZeb9sA/GHz+W5qcCmvguuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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