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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d32c26ab616091b549706f41819eb46cd86b32b10f6febf779ff1819a70b70a' 
  AND token = 'QnKYca1OBz47BqtQKhsp7MGbJcpPvE313gyq5nVfIpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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